Hello ,if you where in Texas i would say thats the truck we traded in,
we had the Crew cab 5.4 best miles per gal we got towing the single axle wolf Pup toy hauler we had was 9 mpg ( we no longer have the Tow Hauler, never had engine concerns,the auto trans was great,had a few a/c concerns ( blend door motor problem) took a long time for a/c to cool we added the we added the Air lift Ride control air bags .
I would check to see what rear gear it has look on the drivers door panel for that info
70 K miles is nothing,if the truck was lightly used,we have a f!50 with 240K on it..
If you have more questions,i have a bunch of Ford contacts ( I worked on fords for Years) shoot me a PM Thanks
2009 Jay Flight G2
2014 RAM 3500 Turbo Diesel